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"Swine Flu" refers to an infectious disease caused by a strain of influenza virus that typically affects pigs, but can also be transmitted to humans through close contact with infected animals or contaminated environments. It is also known as H1N1 flu and was first identified in 2009. Swine flu is highly contagious and can cause symptoms such as fever, cough, sore throat, body aches, headache, chills, and fatigue. In severe cases, it can lead to pneumonia, respiratory failure, and even death. The disease spreads rapidly in swine farming operations, where large numbers of animals are housed in close proximity, creating an ideal environment for the virus to multiply and transmit from animal to animal. Swine flu is also a public health concern due to its potential to cause pandemics, as was seen in 2009 when the virus spread rapidly around the world, causing illness in millions of people. Preventive measures include vaccination of pigs, good hygiene practices, and avoiding close contact with infected animals or contaminated environments.